687386317 has 2 divisors, whose sum is σ = 687386318. Its totient is φ = 687386316.

The previous prime is 687386311. The next prime is 687386363. The reversal of 687386317 is 713683786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687173796 + 212521 = 26214^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 687386317 - 2¹⁵ = 687353549 is a prime.

It is a super-4 number, since 4×687386317⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687386311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343693158 + 343693159.

It is an arithmetic number, because the mean of its divisors is an integer number (343693159).

Almost surely, 2^687386317 is an apocalyptic number.

It is an amenable number.

687386317 is a deficient number, since it is larger than the sum of its proper divisors (1).

687386317 is an equidigital number, since it uses as much as digits as its factorization.

687386317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 687386317 is about 26218.0532648784. The cubic root of 687386317 is about 882.5384338057.

The spelling of 687386317 in words is "six hundred eighty-seven million, three hundred eighty-six thousand, three hundred seventeen".